Rangers announced that players had tested positive ahead of their clash with Alashkert. Those involved and any close contacts are isolating ahead of the Europa League second leg, and the visitors will be confident of going through with a 1-0 lead from the first match.
But while Steven Gerrard 's focus will be on the task at hand, the thoughts of fans immediately turned to Sunday's clash with Celtic.
And it will not be lost on supporters of both sides that Rangers missing several stars would be a mirror image of the first Old Firm game last season.
On that occasion it was Celtic who were hit by the virus, with Odsonne Edouard laid low after testing positive while away with the France Under-21 side.